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Numerical simulation of mass transfer and fluid flow evolution of a rectangular free jet of air

机译：矩形自由射流的传质和流体流动演化的数值模拟

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The paper presents Large Eddy Simulations (LES) of mass transfer and fluid flow evolutions of a submerged rectangular free jet of air in the range of Reynolds numbers from Re = 3400 to Re - 22,000, with the Reynolds number, Re, defined with the hydraulic diameter of the rectangular slot, of height H. The numerical simulations are 3D for Re = 3400 and 6800, while 2D for Re = 10,400 and 22,000 to reduce computational time costs. The average and instant LES numerical simulations are compared with the concentration visualizations, obtained with the Particle Image Velocimetry (P1V) technique, and the fluid dynamics variables, velocity and turbulence, measured with the PIV technique and the Hot Film Anemometry (HFA). In the numerical simulations, the Schmidt number is equal to 100 to compare the air concentration in the PIV experiments, while the turbulence on the exit of the slot is equal to the value measured experimentally, and ranging between 1% and 2%. The average 2-3D LES simulations are in agreement with the concentration and the fluid dynamics experimental results in the Undisturbed Region of Flow (URF) and in the Potential Core Region (PCR), while the vortex breakdown is captured only by the 3D LES approach. As far as the instant flow evolution is concerned, the 2-3D LES simulations reproduce the Negligible Disturbances Flow (NDF), where the jet height maintains constant, and the Small Disturbances Flow (SDF), where the jet height oscillates, with contractions and enlargements, but without the vortex formation. Average and instant velocity and turbulence numerical simulations on the centreline are in good agreement to the experimental PIV measurements.
机译：本文介绍了沉没矩形自由射流在质量雷诺数Re = 3400至Re-22,000范围内的传质和流体流动演变的大涡模拟（LES），其中雷诺数Re由液压确定。矩形槽的直径，高度为H。对于Re = 3400和6800，数值模拟为3D，对于Re = 10,400和22,000，数值模拟为2D，以减少计算时间成本。将平均和瞬时LES数值模拟与通过粒子图像测速（P1V）技术获得的浓度可视化进行比较，并通过PIV技术和热膜风速法（HFA）测量流体动力学变量，速度和湍流。在数值模拟中，施密特数等于100以比较PIV实验中的空气浓度，而缝隙出口处的湍流等于实验测得的值，范围在1％和2％之间。平均2-3D LES模拟与无扰动区域（URF）和潜在核心区域（PCR）中的浓度和流体动力学实验结果一致，而涡旋破坏仅通过3D LES方法捕获。就瞬时流量变化而言，2-3D LES模拟再现了射流高度保持恒定的可忽略扰动流量（NDF）和射流高度振荡，收缩和减小的小扰动流量（SDF）。增大，但没有涡流形成。中心线上的平均速度，瞬时速度和湍流数值模拟与实验性PIV测量非常吻合。

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